Balanced preamps with Atma-sphere MA-2's

Congratulations on acquiring the MA-2 amps! Hope you enjoy them as much as we have here; I cannot imagine ever going back to a tranformer coupled amp after living with these beautiful OTLs.

I drive mine with an Aesthetix Io Signature (with volume controls) using the single-ended RCA outputs (gasp) to great effect. I have yet to try them with a balanced cable so I don't know if that would improve the results I'm getting, the single-ended sounds so doggone good.

One thing that has made a very handsome improvement, however, has been the change to Sylvania 6SN7-GTAs for the input stage. This seems to be a very nice combination with these amps.
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I'm with Rushton, I don't expect to ever try any other amps as my M-60's work so well with my Köchel K-300 horns which I don't plan on changing either. Unfortunately I can't speak to the question you've asked. I can say that Atma-Sphere preamps offer truly outstanding performance.

Hello,
Another congrats on your purchase. These amps took my system to a completely different level than anything prior. I'm using the MP-1 preamp and couldn't be happier. These components together really do synergize nicely as they should. World class sound, tubes and built like the proverbial brick outhouse. How can you go wrong?